How are homozygous individuals different from heterozygous?

A heterozygous organism is an organism that has two different forms of a given gene (different alleles) in homologous chromosomes.
A homozygous organism is an organism that has two identical copies of a given gene in homologous chromosomes.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.